CISA KEV catalog
Confirmed active exploitation.
Listed in CISA's catalog of Known Exploited Vulnerabilities: attackers are using it in real attacks. Patch it with priority.
- Name
- Apache HTTP Server Improper Escaping of Output Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description
Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. Substitutions in server context that use a backreferences or variables as the first segment of the substitution are affected. Some unsafe RewiteRules will be broken by this change and the rewrite flag "UnsafePrefixStat" can be used to opt back in once ensuring the substitution is appropriately constrained.
Affected products
apache: http server; netapp: ontap 9; sonicwall: sma 200 firmware; sonicwall: sma 200; sonicwall: sma 210 firmware; sonicwall: sma 210; sonicwall: sma 400 firmware; sonicwall: sma 400; sonicwall: sma 410 firmware; sonicwall: sma 410; sonicwall: sma 500v firmware; sonicwall: sma 500v
References9
- httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory
- httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory
- github.com/apache/httpd/commit/9a6157d1e2f7ab15963020381054b487… Patch
- security.netapp.com/advisory/ntap-20240712-0001/ Third Party Advisory
- www.openwall.com/lists/oss-security/2024/07/01/8 Third Party Advisory
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0018 Third Party Advisory
- security.netapp.com/advisory/ntap-20240712-0001/ Third Party Advisory
- www.blackhat.com/us-24/briefings/schedule/index.html#confusion-… Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=… Third Party AdvisoryUS Government Resource
Metrics
- CVSS 3.1
-
9.1
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - EPSS — exploit probability
- 100% percentile: 100 · as of 3 November 2026
- CWE
- CWE-116
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